Although considered a rather charming and easy-going person, as the strongest member of the Nine God Generals, Cecilus is incredibly prideful of his position, to the point he believes that he should be the center of the universe and therefore receive attention and praise. Despite this, he is absolutely loyal to the emperor, referring to himself as his sword, and is impossible to bribe.

He is also implied to be somewhat of a flirt as he told the thugs that attacked him that he would be far happier to give them his signature if they were women. He is also shown to be generous, as when he gave the owner of a restaurant too many holy coins and he mentioned that she deserved it.

His sole goal is to achieve the "Heavenly Sword" title, a title that is made for the strongest swordsman existing. Contrary to belief, if it means achieving the Heavenly Sword, he would easily go against the word of his majesty Vincent.

Blue Thunder (青雷 Seirai): Cecilus is able to attack his opponents with blue thunder, which is the origin of his epithet. He can also imbue his katanas with its power.

Extraordinary Speed: Cecilus is able to move as fast as lightning, surpassing human senses, being able to run right through checkpoints without being noticed. When he's serious, he removes his zoori before he runs.

Equipment: Cecilus wields two katana in a red and a blue scabbard respectively which he usually keeps at his waist. His main katana is called Murasame (村雨) which is also known as the Fiend Sword (邪剣), and his second katana is named Masayume (正夢) which is also known as the Dream Sword (夢剣). He also has two short swords and his fifth was broken by Julius.

Immense Power: Cecilus is extremely powerful. He is one of three characters that are around Reinhard's level of power and has caused the latter to draw the Dragon Sword Reid three times.

Both of Cecilus' katanas are part of the so-called Ten Swords of Power. As mentioned above, he wields the Fiend Sword and the Dream Sword. Apart from the Dragon Sword Reid and Yang Sword Vollachia, they are the only Swords of Power who's whereabouts are known.